Be advised, AMD is finally releasing a patch to fix this issue.
Watch for updates from your Computer Manufacturer, as well as AMD and Microsoft on their progress with this.
If AMD hadn't kept insisting they didn't need a patch....
They would have been ready...like ARM and INTEL were when the patch was released.
https://www.theverge.com/2018/1/11/16880922/amd-spectre-firmware-updates-ryzen-epyc